Question about Craftsman 3 gal. Air Compressor, 1.5 hp, Horizontal k

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I drained the air out of my craftsman 26 gallon compressor. Now the screw lets air back through and will not stop even if it is screwed all the way in or not.

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Your petcock sounds like you have a blockage or a worn/damaged seat. Go and get a replacement petcock and change it out.

Posted on Nov 11, 2009


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It shut off at 50 PSI

Did you try draining the excess water from the tank? Mine does this if there's water in the tank. You'll find a 'petcock' valve at the bottom of the tank. With partial pressure in tank, on screw the vavle slowly until it starts to drain. Let it drain all the water out then reclose the valve and try again.

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Im guessing this is a recip (piston Compressor) Sounds like your pressure switch may have adjusted itself by vibration. Take the cover off the pressure switch, there should be 1 or 2 screws on the top, one adjusts the pressure, the other adjusts the differential pressure (There may just be one) turn the pressure screw in the direction of the +, you need to do trial and error on this, turn it 1/4 of a turn, then switch on, see what the pressure gets to, then switch off, drain some air off, then adjust as necessary until you get your required pressure. Hope that helps

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26 gallon model 919.167700 160 psi 1.6 hp Bottom of the compressor has a threaded air relief valve that cannot stop the compressed air from escaping. The compressor is new?! I tried using teflon tape...

if it's leaking from the center ,try loosening it let air blow out & tigthen .--- if it's leaking from the theads try tigthening it some more without breakage //////// this valve is the same as a metal radiator petcock with pipe threads that are tappered // return the compressor if still under warranty or try pipe dope -- check for crossed threads--buy new petcock from auto parts store .....a street elbow & 4'' of pipe & quarter turn vavle from the home depot ( or similer supply store ) works nicley as a replacement / this way you can reach the valve to drain the water with out laying on the ground.--------------1/4 pipe thread i think .

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I have a 33g craftsmans air compressor oilless

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